Which of the following are wrong?

Options

A. `SH_(6) and BiCI` do not exist
B. There are two `p pi - d pi` bonds in `SO_(3)`
C. `SeF_(4)` and `CH_(4)` are tetrahedral ion
D. `I_(3)^(Theta)` is a linear molecule with `sp^(3)d` hydridistion

Answer

C

Explanation

(a) `SH_(6) and BiCI_(5)` do not exist . In `SH_(6). EN` of H atom is not sufficient to exicite `e.s` from `3p` orbatials from S-atom. In `BiCI_(5). Bi^(3+)` is more stable than `Bi^(5+)` due to inert pair effect.
(b) `(p pi - p pi) bond = . (p pi - d pi) bond = 2`
( c) Wrong = due to one `1 p of e s` its shaps is see -saw.
Hybridisation of `CH_(4) implies sp^(3)` and tetrahedral.
(d) Correct hybridisation of `I_(3)^(Theta) (H_(2)^(Theta)) implies (1)/(2) (7+2+1) = 5 = sp^(2)d`
Due to three e s, it is linear